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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ce98b26db476bebd863c30f5b88d901e10284dfa276507f2961f3da6ce411e' 
  AND token = '208MaGyLH2YrJmVW0Rw0Q49bJFTHwgUzwR6SIereSAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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