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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8961c4dee30e694e521e323fcae87fc0c31d4af59850ad35b21ebf948ccbced0' 
  AND token = 'eBdm0vfekaqEFMSl+OzePKd7FBstaKOkRARqmgGhUPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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