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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0b0e25e06ab3b5689f8bf7c2520bcac6346db266105ff6e848a9d97434346b' 
  AND token = 'BxV4UXc4OviRhQ6O+xUTF6Wj2IyxHxcb/jeIuqrpB2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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