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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6b54a2873122a693f08419eeb9aa8981a6cd40e4cece9b3e358b8fbb1d7965' 
  AND token = '5/pAUIrQab0AAy2yvYz21MK+uYoc1Rf8cSA+a5eCFSk=' 
  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"
    }
  }
}