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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bc2fa5da1e6750960d2a39b60529e8fa799995590c90ef933cd8d7a07d972a' 
  AND token = 'Qv9SBsqyrAXMm97Z0DKCAep8GCOyp5ij/MaGSylWjKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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