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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5887dea0024a096d4fd90044ab7f106c061537043e8a314606cb739798cba586' 
  AND token = 'o2wM5y7Cwy4AVdFO8r09pEMtxAUPg9bsJ7NsWzQH/o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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