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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb9fab2b631cbc97482d1927dd95a0017a9f2136c3b438f9682b0ece2ee66a9' 
  AND token = '5aD2Ue+Jy7AYlptr+rv/dhJdFO5gOLZneuBeIMHdzmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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