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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2b0f86bb9f4eb2a504c9be9542d67583e64cc076bb1e98d165120d865c2d26' 
  AND token = '01w2u0SPKEE70e37Pdr2Xn9HoVX8739r2OPBz21v9lE=' 
  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"
    }
  }
}