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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00765712f13211bd5c5c4b06d6cfa39d47ba56481f101b26e7b6a0823d2bd885' 
  AND token = 'P1EQPBJeghaKPAprbqnIlPtJK+XCNQBPXyDHsxQC3qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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