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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fd2037d0aabbde61c2f84d3c8a60df9a3aafcf778cffe1d00e76de7a83919b' 
  AND token = 'Q3wBEJs+1bnJFvcwAExyx72eZ3Mjtr78EI+6tEtQbGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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