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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a372c1995985585e542d6e2e593a7480d1ce3df2ee7e68a0b2b77f3a68bbe724' 
  AND token = 'q5gVejTAE2Pzl1M1LmSmRahD1l2yjFVDPv8e3vZFAdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}