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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2552905263d237856b3e5e9dd7b5d5e3443f358d58247c4956d0d63615eb3caf' 
  AND token = 'Z6743fOsMY0c7e19I33Fi1SMW7d9GEeOlKIi23KCoqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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