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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702211e258226e0f2355fc176cb3f336797d4c9b2fda6bf2ef7769359100e163' 
  AND token = 'xKRD5lN29Ff99IyfCT3l94CK161wk+Ne7c/jEPnIwAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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