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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b61e72377e06076ea19f784a74eeaec187d0ffd7f2172204aae47262a3b86f' 
  AND token = 'Z4gtbv3hEaPbQlch1hcxCR4v2IWvxPJx/O9IS69haFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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