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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1c18b073b3fd8ead856f95ad0dd30bf1c3d262390efb4f59552dedce037ebb' 
  AND token = '25jW7q1kyCexBlPkRt5gsiEnnHejgb3Ue6JA3Fsrk8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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