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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c336e3c96e2bb1a05b3faf95a6243707e87f1555446714975d2eb39eb36d3ea1' 
  AND token = 'aXq3tK+cMJdlPAl075EbGcyeTpMBc+dVudcOOOQwjzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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