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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26d5759fad33e9621d09718f038d052ef3cfac750add4dd05ab76f765e2249d' 
  AND token = '01Af9ILBcMUCCmTIKA771lV7XemehHCvKVWYe8ZHLf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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