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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758cb4526adab866000aeeb957c87540dac1270db41ba76a803ccbcac6201494' 
  AND token = 'QA+4nG2md4A1Y625Ts0Fj3QWoPKYISajPieUV4D2obA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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