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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9ddd8ef875aeada26c969608c3904293e6b7233c4e0ca6ca9e2e6d40c87959' 
  AND token = 'FTRx6ORUKFWJDAwwE1+Ecr1ycqHNITkntke6+eHltbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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